SU1444096A1 - Crank shears for cutting merchant rolled stock - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the blank production for cutting long products. The purpose of the invention is to reduce the metal consumption and increase the reliability of crank shears for cutting long products. Before cutting, the rolling is pressed against the lower knife 19. The cutting slider 14 with the knife 15 is lowered until it comes into contact with the rolled steel and stops in this position. The drive slider 11 continues to lower, and the semi-cylindrical levers 16 raise the frame until the bottom clamp 6 approaches the cut-off. I rolled it. Thereafter, the drive slider 11 moves downwards along with the cutting slider 14 and the frame, and a piece of the workpiece occurs. 1 hp f-ly, 2 ill.

Description

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The invention relates to the processing of metals by pressure and can be used in the blank production for cutting rolled sections,

The purpose of the invention is to reduce metal consumption and increase the reliability of crank shears for cutting long products.

Fig. 1 shows the scissors with a crooked jo frame 2, the latter remains stationary for cutting long products, general view; in fig. 2 is a section A-A in FIG. 1,

Crank shears for cutting long products include frame 1 and frame 2 placed on it, curvilted lead of 3 with eccentric shaft 4 and machine 5 clamping mechanism. The frame 2 with the clamp 6 fixed on it is installed in the guides 7 and the upper bolt a contacts with the stop 85 made in the form of a rod of the power cylinder 9,

Inside the frame 2 in the guides 10 is placed a driving slider 11, in the central bore of which an eccentric bushing 12 is mounted, which is connected to the crank drive 3, and in the guides 13 - slider 14 with the upper knife 15, two shoulders are mounted on the cutting slider 14 semi-cylindrical (segment) levers 16, interacting with spacers 17 made in the form of rollers pivotally mounted on the frame 2 and on the drive slider 11, and stops 18, which interact with the lower crossbar of the frame 2. On the base 1 there is also a lower knife 19, on which The rolled carriage lies 20. The cutting slider, the greater the resistance to pro- is connected to the rods 21, which are installed during cutting, the greater the forces on the base 1 of the power cylinders 22, the total force of the cylinders 22 exceeds the weight of the cutting slider 14 with the elements placed on it and the weight of the frame 45 2 with the elements placed on it, transmitted to the cutting slider 14 through the two shoulders semi-cylindrical levers, and the force of the grindra 9- exceeds the total force of the cylinders 22 by minus Q all parts held by these cylinders,

Scissors work as follows.

By cutting the workpiece is clamped between the knife 15 and the clamp 6, i.e. differentiated clamping of the workpiece during its cutting is carried out. At the moment of cutting the workpiece being cut, the resistance of the prok.ate drops sharply from the maximum force. To zero and the frame 2 under the action of the elastic recoil of the system. It tends to accelerate downwards. and the slider 14 is decelerated by the force CI.PINDROV 22. After the frame 2 is stopped in the extreme lower position, when the eccentric vallages rotate, which approximately coincides in

4 of the crank drive 3 of the eccentric bushing 12 oscillates relative to the center of the bore in the slider 11, the slider at the same time passing the lower dead point by the slider 11, the frame 2 under the action of the cylinders 22 rises up and again presses the cut off

It performs vertical reciprocating movements, the cutting slider 14 also reciprocates, and the two shoulders semi-cylindrical levers 16 are deployed relative to their axes, turning spacers 17, On the track section of the slide 14, equal to the gap between the stops 18 and

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The NOA, on the rest of the path, the frame also reciprocates, detaching itself from the stop 8. In the path section of the slide 14, when the cutting edge of the knife 15 is above the level of the rolled stock 20, it occurs. feed to the length of the cut piece (bar feeders and length of the workpiece are not shown).

After the rolled stock is delivered to the required value, the rolling clamp mechanism 5 presses it to the lower knife 19. Under the action of the drive slide 11 moving downward through the levers 16 and the spacers 17, the cutting slide 14 with the upper blade 15 also goes down until the blade 15 touches the hire 15, After when the blade 15 is in contact with the rolled 20, the cutting slider 14 stops, the semi-cylindrical levers 16, turned under the action of the moving slider 11, lifts the frame 2 upwards, breaking the force of the cylinder, 9. When the lower pressure 6 approaches the P-cut rolling 2 0, frame 2 stops, From this moment, the slider 11, the cutting slider t4 and the frame 2 jointly move downward, producing a piece of the workpiece from rolling 20. When

By cutting the workpiece is clamped between the knife 15 and the clamp 6, i.e. differentiated clamping of the workpiece during its cutting is carried out. At the moment of cutting the workpiece being cut, the resistance of the prok.ate drops sharply from the maximum force. To zero and the frame 2 under the action of the elastic recoil of the system. It tends to accelerate downwards. and the slider 14 is braked by the force TS.PINDROV 22. After the frame 2 stops at the lower half of the passage of the lower dead point 11 by the slider 11, the frame 2 under the action of the cylinders 22 rises up and again presses the cut off piece y, 6 clamp the upper knife 15, if the preform was short and left lying on the bottom nip. If the workpiece was long, then it goes down into the tray when the frame 2 is running, and when the frame is raised 2 by the cylinders 22 upward, the tool closes up: the knife 15 and the clamp 6. In the absence of the tool (work

at idle strokes, the closure occurs through the stops 18. In all cases, the turn of the levers 16 is limited and the mechanism does not jam.

Next, the frame 2, together with the cutting blade 15, the slider 14 follows the driving slider 11 upward until it contacts with the stop 8, which fixes it in the initial position for. next cut. Upon further upward movement of the driving slider 11, the cutting slider 14 under the action of the cylinders 22 rises upwards. As soon as the upper knife 15 rises above the rolled 20, its next feed begins. The clamping mechanism 5 is raised upward when the driving slider is in the lower position. Then the cycle of operation is repeated.

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Claims (1)

Invention Formula 1, Crankshaft shears for cutting long products, containing a frame, in the guides of which a frame is placed, power CYO associated with the frame five 0 lindra, drive and cutting sliders mounted in frame guides with the possibility of interaction between themselves and the frame by means of spacers in the form of rollers with shafts pivotally mounted on the frame and drive slide, and two-arm semi-cylindrical levers hinged on the cutting slide, resiliently resting, mounted on the frame with the possibility of interaction with the frame, stops limiting the mutual movement of the frame and the cutting slide, the mechanism for clamping the cut-off rolled metal and the crank drive, characterized in that With metal consumption and increased reliability, the rods of the power cylinders are rigidly connected to the cutting slider, and the stops for limiting the mutual movement of the frame and the cutting slider are mounted on the lower end of the last 5, with the possibility of interaction with the lower frame crossbar, 2, Scissors POP.1, characterized in that the crank drive is made in the form of an eccentric 0 sleeve located on the crank neck of the eccentric shaft with the ability to interact with the outer surface of the drive slider.